I'm being overly pedantic here on purpose so feel free to push back. With that in mind:

• For Path, change to Path with context? Or string with context? This would give ppl a keyword to search for
• in the let ... in example, isn't there too many times the word "return"?
• Merge attribute sets using //, I would use a nested attribute for x on the left side, this way in the second example where the right attrset overrides x, it is clear that the value of the right attrset replaces completely the value on the left. So { x.a = 1; } // { x = 2; } => { x = 2; }
• concatenate paths and strings IMO is confusing because it doesn't answer the questions what and why is there a difference between a path and a string
• Named arguments as attribute set; I would rename this to Attribute set as first argument. IMO it makes it a bit more obvious that it's a function with one argument that is an attribute set.

In reply to @garbas:matrix.org
I also won't be able to attend. I'm too exhausted.